Gastropoda - Euomphalina - Helicotomidae
Alternative spelling: Helicotominae
Full reference: W. Wenz. 1938. Handbuch der Paläozoologie; Gastropoda. Handbuch der Paläozoologie 1-240
Parent taxon: Euomphaloidea according to P. Bouchet et al. 2005
See also Golikov and Starobogatov 1975, Jeffery 2003, Knight et al. 1960, Kosnik 2002, Morris and Cleevely 1981 and Wagner 1999
Sister taxa: Anomphalidae, Elasmonematidae, Euomphalidae, Holopeidae, Kitikamispira, Lesueurillidae, Microdomatidae, Neoplatyteichum, Nettersheimia, Omphalocirridae, Omphalocirrinae, Omphalotrochidae, Ornollus, Planitrochidae, Pseudophoridae, Pycnomphalidae, Rhenomphalus, Serpulospira, Tychobraheidae
Subtaxa: Amphelissa Boucotspira Boucotspira Helicotoma Lophonema Ophiletina Palaeomphalus Paraviviana Yochelsoniella
Ecology: stationary epifaunal suspension feeder
Distribution:
• Jurassic of Hungary (1 collection)
• Devonian of Australia (2)
• Silurian of Sweden (4)
• Whiterockian of United States (6: Nevada, Virginia)
• Chazyan of Canada (3: Quebec)
• Arenig of Greenland (4)
• Arenigian of United States (1: Virginia)
• Ordovician of Australia (4), Canada (24: British Columbia, Newfoundland and Labrador, Nunavut, Ontario, Quebec), China (4), Czechia (1), Estonia (5), Greenland (3), Malaysia (1), North Korea (1), Norway (3), South Korea (1), Sweden (3), the United Kingdom (6), United States (123: Alaska, California, Colorado, Georgia, Illinois, Illinois, Iowa, Indiana, Kentucky, Michigan, Minnesota, Missouri, Nevada, Ohio, Oklahoma, Tennessee, Texas, Vermont, Virginia, Wisconsin)
Total: 200 collections including 295 occurrences